Absence of conventional room-temperature superconductivity at high pressure in carbon-doped H3S
Tianchun Wang, Motoaki Hirayama, Takuya Nomoto, Takashi Koretsune, Ryotaro Arita, José A. Flores-Livas
DOI 10.1103/PhysRevB.104.064510 · Physical Review B
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Abstract
In this paper, we show that the same theoretical tools that successfully explain other hydride systems under pressure seem to be at odds with the recently claimed conventional room-temperature superconductivity of carbonaceous sulfur hydride. We support our conclusions with (i) the absence of a dominant low-enthalpy stoichiometry and crystal structure in the ternary phase diagram. (ii) Only the thermodynamics of C-doping phases appears to be marginally competing in enthalpy against H3S. (iii) Accurate results of the transition temperature given by ab initio Migdal-Eliashberg calculations differ by more than 110 K from recent theoretical claims explaining the high-temperature superconductivity in carbonaceous hydrogen sulfide. An unconventional mechanism of superconductivity or a breakdown of current theories in this system is possibly behind the disagreement.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| H3S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 203 | 150 GPa | unknown |
| LaH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 250 | 170 GPa | unknown |
| CxS1-xH3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 180 | 250 GPa | unknown |
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